American spells are silent.
American spells are silent- one of the only people to use verbal spells in the WHOLE movie was Newt. The British guy.
American spells are silent- their country was colonized by Puritans. America, from the time of its colonization, persecuted witches. They taught silent spells so they didn’t draw attention to wizardkind.

“He’s now in the Marvel Cinematic Universe, and he can interact with the characters in that universe. I think that this mentor relationship that Tony has developed with Peter Parker is probably one of the most interesting things the universe has moving forward.”